Question

A new branch in its first year opened new accounts at a rate of 40 for every 100 customers calls. The total number of new accounts opened in the year was 10,000. How many customers calls were made?

Answer 1

40 new accounts          for:   100 customer calls
10,000 new accounts   for:   x customer calls.     
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40 :  10,000 = 100 : x
x = (100 · 10,000 ) : 40 = 25,000
Answer: 25,000 customer calls were made.